Integrated intensity distributions of the HCN 1−0 (left panel, in magenta), HCO⁺ 1−0 (centre panel, in red) and CO3−2 emission contours (right panel, in light blue) at the same spatial resolution (~1.1′′× 1.0′′) on top of the CO2−1 high-resolution emission (background and gray contours; König et al. 2014). Contours start at 5σ and are spaced in steps of 3σ (1σ(HCN 1−0) ~20.2 mJy beam^-1 km s^-1, 1σ(HCO⁺ 1−0) ~21.2 mJy beam^-1 km s^-1, 1σ(CO3−2) ~1.6 Jy beam^-1 km s^-1). The inset in each of the images shows the higher-resolution data for each tracer (beam sizes: 1.0′′ × 0.8′′, 1.0′′ × 0.8′′, 0.7′′ × 0.7′′). North is up, east to the left. The position of the 1.4 GHz continuum peak is marked by a white cross (Beswick et al. 2005).